/**
 * @author gao
 * @date 2025/7/25 15:19
 */

class Point {
    /*public Point(double x, double y) {
        // 笛卡尔坐标系表示
    }

    public Point(double r, double α) {
        // 极坐标系表示
    }*/
}

class PointBuilder {
    public static Point buildPoint_XY (double x, double y) {
        Point p = new Point();
        return p;
    }

    public static Point buildPoint_RΑ (double r, double α) {
        Point p = new Point();
        return p;
    }
}

public class Demo1 {
    public static void main(String[] args) {
        Point p = PointBuilder.buildPoint_RΑ(10, 0);
    }
}